The present active infinitive is the second principal part (in regular verbs).
There are two conjugation classes of regular verbs, as illustrated below.
A regular verb in Latin belongs to one of four main conjugations.
The conjugation system of regular verbs is rather complex.
There are regular and irregular verbs in the language.
In regular English verbs, the past tense and past participle have the same form.
Given all possible combinations of affixes, each regular verb can have 21,262 inflected forms.
In Cherokee, for example, each regular verb has 21,262 forms.
However, for nearly all regular verbs, a separate thou form was no longer commonly used in the past tense.
Looking back, he remarked, "I soon learnt that it was not a good idea to come home excited over regular verbs".
Wörterbuch für linguistische Begriffe